[Amps] PS project

[Dudley Hurry]

Lynn,

You did not say if you were using a bridge or full wave rectifier and is the
transformer center tapped..    Reason I asked, is that I used a transformer
from an old RCA amp, that had a 5650V center tapped .  With a bridge, the
circuit breaker would trip with about 7000 VDC, I switched to a full wave
with the center tap for the negative return.   Running this to a cap, 40uf,
would give me 4000 vdc.  Under full load of 1 amp, the voltage would drop to
3900, with 200K bleeder resistors.   Worked out perfect for the 8877 that I
was driving at the time..   I used crossing solid state relays on the input
instead of a step-start, and that works perfect...

Just some of my experiences..

Thanks and 73's,
Dudley
WA5QPZ
jhurry at austin.rr.com




----- Original Message -----
From: "Lynn" <no9z at soltec.net>
To: <amps at contesting.com>
Sent: Thursday, April 10, 2003 1:11 PM
Subject: [Amps] PS project


> Hello all......  I need a little advice on this powersupply project.
>
>   I have almost completed a nice  5000 v   2amp supply using a large
> Wilcox transformer with a capacitive filter.   50uf at 7kv.
>
>    I found out after construction that the Wilcox transformer requires
> a choke input.   The circuit breaker trips  (25amp) when sending a
> cw signal from the radio  (occassionaly).  I believe the output
> impedence
> of the power supply is too low, thus causing excessive current .  It
> appears this happens when the ac cycle is at its peak.
>
>    Is there a solution to this problem where I can still retain the 5kv?
>
> I understand that if a choke is installed in the b+ the output will be
> .9 of the rectified ac instead of 1.3 times the ac supply volts.
>
>    Ideas?
>
> Lynn  NO9Z
>
>
>
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps